Machine for grinding wood or like materials.



No. 687,024. Patented Nov. I9, |90l N. lI'IEI. A

MAGHIN FUR GRINDING WD 0B LlKE MATERIALS.

(Application filed July 20, 1901.) (No Modal.) 42 Sheets-Sheet F A ,par VJ Hm una 687,024. Patented Nov. i9, |901.

- n. msm. Y MACHINE FR GRINDING WOOD 0R LIKE MATERIALS (Application med July 20, 1901.) am' Model.) 2 sheets-sheet 2` UNITED rSTATES l' PATENT .'OFFICE.

NICOLAUS HEID, OF STOCKRAU, AUSTRIA-HUN GARY.

MACHINEFOR GRINDING wooo 0R LIKE MATERIALS.

SPECIFICATION forming part of Letters Patent No. 687,024, dated November 19, 1901.

Application filed J'uly 20. 1901. Seria-l No. 69,087. (No model.)

To aZZ whom t may concern:

Be it known that I, NICOLAUs HEID, a subject of the Emperor of Austria-Hungary,resid ing at Stockerau, in the Province of Lower Austria, in the Empire of Austria-Hungary, have invented certain new and useful Im' provements in Machines for Grinding or Comminuting Soft and Tough Materials; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part ofl this specification.

Heretofore stone-mills or roller-mills have been used for grinding or comminuting soft tough materials, like wood. Owing to the small peripheral speed and blunt operatingsurfaces of these grinding apparatus it is not possible to obtain a high degree of ineness, together with a satisfactory eciency, relatively to the power used in such machines. Experiments have shown that light tough fibrous materials, like wood, can be comminuted with good results only by machines having a high speed of revolution and operating-surfaces provided with ribs formed like the teeth of a saw.

The present invention relates to a mill hav-A ing a new kind of grinding-surface, as will be described with reference to the accompanying drawings, in whichm Figure 1 is a vertical section of the machine; Fig. 2, a front elevation of the internal organs of the machine, and Fig. 3 a detail View.

The machine consists of a casing a Z) with a shaft d revolving in the bearing c and carrying a disk e. Into the edge of this disk are inserted six or more knives s, the cutting edges of which are turned in the direction of rotation of the disk. vIn the back wall of the casing'is fixed, by means of screws Zo, a ring g of knife-blades h, mounted on bars t', bent to the form of circular arcs. The blades h are separated by distance-plates j and have ribs o, Fig. 3, on their faces, so that they cut like the teeth of a saw. Opposite this ring of blades there is a similar ring of blades h,

xedto a ring Z. By means of cross-bars n the ring Z is fixed to 4a second ring m, so that owing to the arrangement of this double ring Z m there is formed anannular channel closed on its exterior periphery by a flne-meshed sieve p, attached to the rings Zm. ring, on whichthe knives are fixed, is held in place by a piece jb of the casing, which forms a sort of cover. The annular channel between the rings can Ialso be arranged so that the knives are situated on the periphery in the place of the sieve, while the latter is in the position occu pied by the knives in the construction shown.

The mill operatesas follows: The material-say wood-shavings-is fed into the mill through the hopper f and passes into the annular channel, where it has knives on either side and the sieve on its periphery. Here the disk eis rotatingatgreat-speed and by means of its knives s` presses the material against the rings of knife-blades, so thatit is comminuted to the desired degree of fineness and falls through the sieve p to leave 'the mill at t.

I claim- Y 1. A grinding-machine, comprising a substantially circular casing, oppositely-dis posed circular grinding-surfaces composed of separate interspaced plates `having their proxi- The front mate edges serrated, a knife-carrier revoluble between said grinding-surfaces and means for feeding the material to be ground to the space between the grinding-surfaces, for the purpose set forth. 1

2. A grinding-machine comprising a substantially circular casing,oppositely-disposed grinding-surfaces composed of separate interspaced plates having their opposite edges vand one of their faces serrated, a knife-carrier revoluble between the proximate serrated edges of said grinding-surfaces and means for feeding the material to be ground to the space between said grinding-surfaces, for the purpose set forth.

3. A grinding-machine, comprising a substantially circular` casing having a discharge passage at its foot or lower end, oppositely` disposed grinding-surfaces composed of separate interspaced plates having .their proximate edges serrated, a knife-carrier revoluble between said grinding-surfaces, and a foraminous material surrounding said grinding-sur` faces andknife-carrier, for the purpose set forth.

4.- A grinding-machine, comprising a substantially circular casing having a dischargepassage at its foot, oppositely-disposed grinding-surfaces composed of ring-carriers, plates h having serrations o and spacing-plates j, threaded on said carriers as set forth, and means for feeding the material to be ground to the space between the grinding-surfaces, and a knife-carrier revoluble in the space between the aforesaid grinding-surfaces, for the purpose set forth.

5. A grinding-machine, comprising a substantially circular casing composed of two members, a grinding-surface on the inner face of one of said members composed of separate interspaced plates having their inner edges serrated, means for detachably securingsaid v grinding-surface to said casing member, a

similar complementary grinding-surface arranged opposite the first-named grinding-surface, meansheld against displacement by the other casing member for supporting said comple mentary grinding-surface and holding the same at a suitable distance from its companion surface; in combination with a knife-carrier revoluble in the space between said surfaces and means for feeding` the material to and discharging the ground material from said space for the purpose set forth.

6. A grinding-machine, comprising a substantially circular casing composed of two members, a grinding-surface on the inner face of one of said members composed of separate interspaced plates having their inner edges serrated, means for detachably securing said grinding-surface to said casing member, a similar complementary grinding-surface arranged opposite the first-named grinding-surface, a foraminous material surrounding the said grinding-surfaces, means held against displacement by the other casing member for holding the foraminous material in position and for supporting said complementary grinding-surface and holding the same at a suitable distance from its companion surface; in combination with a knife-carrier revoluble in the space between said surfaces, and means for feeding the material to and discharging the ground material from said space, for the purpose set forth.

7. The combination the casing members ct, b, a carrier t' secured to the inner face of member a, a similar carrier arranged on the proximate inner face of casing member b, each of said carriers having grinding-plates h and spacin,g., platesgl threaded thereon, the interconnected spaced rings 'm and Z surrounding the carriers t' and grin ding-plates thereon and held in position by the casing member h; of a revoluble shaft mounted axially of the casing, and a knife-carrier secured thereto and revoluble between the grinding-plates on carriers t', substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

NICOLAUS HEID. `litnesses:

JOSEF RBARCHT, ALvnsTo S. Hoeun. 

